Trolley.



Patented Ifiay ham.

C. H; BiEFfiBAUPvi.

TRGLLEY.

(Application filed Jan. 20, 1900.)

10 Model.)

\mmwo m Q Km m M M r W UNITED STATES" CHRISTOPHER H. BIERBAUMQOF BUFFALO, New resilience; MESNE ASSIGNMENTS, r0 run-nineteen. a Manama-mar PANY, OF SAME PLACE.

TROLLEY'.

ATENT SPEGIFIGATIORforming part of Letters Patent No. 648,834, dated May 1, 1900.

Application filed January 20. 1900. Serial No. 2,097. (No model.)

To (oZZ whom it may concern.-

Be it known that LCHRISTOPHER H. Bran- BAUM, a citizen of the United States, residingat Bnfialo, in the county of Erie, State of New York,have invented a new and useful Trolley- Wheel for Electric Cars, of which the following i's'a full specification.

My invention relates to trolley-wheels of the sectional or built-up type, and has for its object to provide a wheel that can be constructed for the least possible firstoost and at the same time be very serviceable by having a long life and extreme lightness. These and other objects in view will readily appear as the nature of the invention is described with refer ence to the accompanying drawings.

In the drawings, Figure 1 isaside elevation- Fig. 2 is a transverseof the trolley-wheel. section of the same.

Referring to Fig. 2, A and A represent two stamped flange-plates madeof any suitable sheet metal, an 13 a ring made of a suitable good electrical conductor, as copper, bronze, or brass, with a groove on its outer edge for.

engaging with the trolleywire, all held together firmly by the'metal body 6, the same constituting thehnb. The flange-plates A and A can be made by any person familiar with the art of metal'stamping, and the ring B'can be made either as a turned-up casting -or,as' a finished short section of a tube, and the assembling of this wheel is still more simple. The plates A and A and the ring B are placed in a sand mold, havingitheir relative positions to eachother. is then poured in. .The making of the mold and the pouring of the metal involve no difficulty and can; he performed by any molder offordinary skillandintelligence. This hub construction, however, is made possible by the use of an alloy covered by United States Patent No. 632,442, datedseptember 5, 1899, and an exact proportion. of the constituents that are suitable forthis purpose is zinc eightysix, copper ten, and aluminium four. The special valuable characteristics of this alloy for this purpose are these: It has a comparatively-low melting-point, and for this reason The body ofmetal C when poured in and upon the other parts willv not heat them to distortion before it itself being the connecting and binding member for 1 holding the different parts of the Wheelingether in the most practical and rigid manner. It also constitutes the hub of the wheel.

The lightness of this metal and its superior antifriction qualities make this hub constrnction a most efficient and economic one. In addition, this Wheel possesses all the advantages that built-up'wheels ordinarily havev over cast whcels-namely, that of being perfectly balanced. 1

. Changes in the form and proportion of parts andthe detailed construction of that herein 7 Also the composition of the alloy for the hub may be varied shown may be resorted to.

somewhat without departing from the principle or sacrificing any of the advantages of my invention. r

I am aware that sectional or built-u p trolley-wheels are not new, as a number of patents have already been granted for difi'erent forms and types ofthis wheel,such as'No. 559,461, dated May 5, 1896, and No. 638,470, dated December 5,1899. I am also aware of the fact that vehicle-wheels in general have been made of parts held together by a hub cast in and around these parts, such wheels as are commonly used in agricultural machinery. I therefpre do not lay claim to the broadinvention of these features; but Y What I do specifically claim as new, and desire to secure by United States Letters Patent, is-

1. A trolley-wheel consisting of 'a central ring, supported between two flange-plates,

said flange-plates being held by the hub and said hub being cast on -in-the manner speci- In testimony whereof I have signed my fied. y Y name to this specification in the presence of 2. A built-uptrolley-wheel conr'prising a two subscribing witnesses.

central ring, or tread, held between two CHRISTOPHER II. BIERBAUM.

. stamped flange 0r side plates, all held to- \Vitnesses: I gather and in place bythe hub: said hub be- EDWARD M. SHELDOR,

ing cast on. I S. I 'MERRIGK. 

